Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
Locations and reports
Radon Levels in Ramsey County, Minnesota
EPA puts Ramsey County in Zone 1, its highest radon zone, and 23.5% of its 2,213 reported radon tests (2023) were at or above 4 pCi/L. Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Share at 4+ pCi/L
23.5%
11.1 pts below MN
- Ramsey
- 23.5%
- Minnesota
- 34.6%
2,213 tests, 2023
Median result
2.2pCi/L
Below action level
- Ramsey
- 2.2 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2023
Tests reported
2,213
2nd of 62 by tests
- Ramsey
- 2,213
- Hennepin
- 6,545
Reported to CDC before any fix, 2023
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Rank in Minnesota
54 of 62
Lowest quarter
- Ramsey
- 23.5%
- Renville
- 75.7%
By share, of 62 with 30+ tests
Read a result for Ramsey County
Starts at Ramsey County's median, 2.2 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.2 pCi/L
Between 2 and 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is between 2 and 4 pCi/L. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. Ramsey County's median reported result, 2023.
The data
Ramsey County, At a glance
Ramsey County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Ramsey County in
USGS geologic potential: High across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Ramsey County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 28.6% |
| 2015 | 34.6% |
| 2016 | 29.9% |
| 2017 | 25.7% |
| 2018 | 25.4% |
| 2019 | 25.1% |
| 2020 | 24.0% |
| 2021 | 25.0% |
| 2022 | 22.1% |
| 2023 | 23.5% |
2023: 23.5%. Across these years the share ran from 22.1% to 34.6%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 2,213 tests reported to CDC for Ramsey County over 2023, many from homes being sold or already suspected of a problem: they describe the county's reported tests, not this house.
Measured: CDC tracking data. Figure above: 2023. Measured data period: 2005 to 2023 (every CDC figure on file).
Ramsey County, Compared
Ramsey County radon figures, compared
Calculated by Radon411Ramsey County's 2,213 reported tests in 2023 had a middle value of 2.2 pCi/L and a maximum of 70.9 pCi/L, and 23.5% reached 4 pCi/L. Minnesota as a whole (86 Minnesota counties, pooled) comes to 34.6%: 11.1 points higher than here.
Among its state's counties it ranks 54th of 62 Minnesota counties with 30 or more tests for the same period. Statewide for the same period, Renville County reported the highest share (75.7%) and Lake County the lowest (3.8%).
Below the action level, 1,002 tests (45.3%) came in under 2 pCi/L, against 36.6% statewide, and 692 tests (31.3%) fell between 2 and 4, against 28.9% statewide. The busiest year on file was 2021, with 3,241 tests reported; the quietest, 2019, had 1,409.
EPA's 1993 zone map puts Ramsey County in Zone 1, a predicted county average above 4 pCi/L. USGS geology rates 100% of the county's land high radon potential.
Next door, the shares run from 19.3% in Anoka County to 34.6% in Dakota County, with Washington County and Anoka County below Ramsey County. Over 10 years of annual figures the share fell 5.1 points, from 28.6% in 2014 to 23.5% in 2023; its peak was 34.6% in 2015.
Ramsey CountyMinnesota, pooled
23.5% % of tests34.6% % of tests
| Year | Tests | Ramsey County, at or above 4 pCi/L | Minnesota, pooled |
|---|---|---|---|
| 2014 | 3,151 | 28.6% | 42.9% |
| 2015 | 2,846 | 34.6% | 43.6% |
| 2016 | 2,669 | 29.9% | 37.0% |
| 2017 | 2,757 | 25.7% | 38.2% |
| 2018 | 2,941 | 25.4% | 38.3% |
| 2019 | 1,409 | 25.1% | 36.1% |
| 2020 | 2,172 | 24.0% | 31.8% |
| 2021 | 3,241 | 25.0% | 33.1% |
| 2022 | 2,447 | 22.1% | 31.6% |
| 2023 | 2,213 | 23.5% | 34.6% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Ramsey County, State data
Minnesota's own radon test data
MeasuredWhat Minnesota's own agencies publish about radon tests in Ramsey County, with their period. These are not CDC's figures and are never added to them.
MeasuredState figures, not CDC's
What the Minnesota Department of Health reports for Ramsey County
Radon Testing (MN Public Health Data Access Portal): home radon tests reported voluntarily by private laboratories and licensed radon measurement professionals, counted by property. Period: 2016-2025.
Share with one or more tests at or above 4 pCi/L
26.8%
6,842 properties tested with one or more tests at or above 4 pCi/L
Median result
2.4 pCi/L
Average result
3.0 pCi/L
Tests behind these figures
2,551 properties tested a year on average
- MDH says these data do not include all of the radon tests conducted in Minnesota.
- Post-mitigation tests are excluded from the averages and the median; the percentages use each property's highest test.
- Each home is unique and can have very different results than a neighbor's home; the only way to know is to test.
- These figures describe tests reported to the Minnesota Department of Health in this area. They count a different set of tests than CDC's figures and are not a reading of any one home.
Measured: Minnesota Department of Health data, 2016-2025.
Ramsey County, Geology
The ground under Ramsey County
PredictedUSGS's geologic map puts all of Ramsey County's mapped land in one class: high radon potential. The map puts 77.8% of Ramsey County in the area it calls Central Lowland-Till Prairie and 22.2% in Central Lowland-Western Lake Section. USGS gives both a radon index of 14, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Central Lowland-Till Prairie | Silty and clayey till derived from shale and sandstone. | High | 14 | 77.8% |
| Central Lowland-Western Lake Section | Red sandy till derived primarily from sandstone. | High | 14 | 22.2% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Ramsey County beside the ground around it
Ramsey County has more high-potential ground than Minnesota as a whole: 100% of its land against 61.1%. Of the 4 counties that border it, none has as large a share of high-potential ground; Anoka County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Ramsey County, Local resources
Radon testing and mitigation in Ramsey County
Listed radon businesses with an address in Ramsey County:
- MDH Indoor Air UnitMDH Indoor Air Unit, run by MN Dept. of Health, licenses or certifies radon professionals and states the rule for disclosing radon when a home is sold, and answers questions about testing and mitigation in Minnesota.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsAsk the program whether it has free or discounted kits, or compare kits you can buy.
- Compare kits
- Professionals in Minnesota255 professionals are listed in Minnesota.
Listed radon professionals by town: St. Paul, Blaine, Maplewood, Roseville, Vadnais Heights
What Minnesota's program says
- Phone
- 651-201-4601
- health.indoorair@state.mn.us
- Licensing of radon professionals
The Radon Licensing Act requires anyone who performs a radon test or radon mitigation, in a building they do not own or lease, must be licensed by MDH.
- Disclosure when a home is sold or rented
The Minnesota Radon Awareness Act requires specific disclosure and education be provided to potential home buyers during residential real estate transactions in Minnesota.
What it means
Ramsey County, Questions
Questions about radon in Ramsey County
Are radon levels high in Ramsey County?
In 2023, 23.5% of the radon tests reported to CDC for Ramsey County, Minnesota were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.2 pCi/L. Of 62 Minnesota counties with 30 or more tests for the same period, 53 reported a higher share; pooled, the state comes to 34.6%.
Which counties border Ramsey County?
Ramsey County borders 4 counties: Washington County, Anoka County, Hennepin County and Dakota County.
Products
Ramsey County, Products
Testing a home in Ramsey County
In Ramsey County, 23.5% of 2,213 tests reported to CDC in 2023 reached 4 pCi/L, against 34.6% pooled across Minnesota. In Zone 1 the year-round level in Ramsey County is the one to know: a long-term test (more than 90 days) or a monitor, with a short-term kit for a first answer.
Test kits and monitors3
See every kit and monitor
Monitor
lüft plug-in radon and indoor air quality monitor
- C-NRPP 2024/25: Approved
- Plug-in
- Wi-Fi, Bluetooth
- App only
First reading: Within 90 minutes
Short-term kitempowerDX
Standard Radon Test short-term mail-in radon test kit
- Lab fee included
Method: Passive sampler
In home: 48 to 96 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Ramsey County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Ramsey County
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Ramsey County, Bordering counties
Counties bordering Ramsey County
Calculated by Radon411- Radon levels in Dakota CountyEPA zone 1
34.6%at or above 4 pCi/L
Median 2.9 pCi/L · 2,183 tests · 11.1 points above Ramsey County
- Radon levels in Hennepin CountyEPA zone 1
32.0%at or above 4 pCi/L
Median 2.7 pCi/L · 6,545 tests · 8.5 points above Ramsey County
- Radon levels in Washington CountyEPA zone 1
21.3%at or above 4 pCi/L
Median 1.9 pCi/L · 1,518 tests · 2.2 points below Ramsey County
- Radon levels in Anoka CountyEPA zone 2
19.3%at or above 4 pCi/L
Median 1.9 pCi/L · 880 tests · 4.2 points below Ramsey County
Ramsey County, Cities and towns
Cities and towns in Ramsey County
About 541,623 people live in Ramsey County by the Census Bureau's estimate for July 1, 2025, 10,110 fewer than in 2020 (−1.8%). Packed into its land, that is 3,558 people per square mile. St. Paul alone is home to 306,684 of them, 56.6% of the total. CDC's 2,213 reported tests for 2023 work out to 4.1 per 1,000 residents (2025 estimate), close to Minnesota's 3.9.
From St. Paul to Gem Lake, CDC publishes no figure by town: each reads Ramsey County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| St. Paul | 306,684 | −1.4% | 56.6% |
| Blaineextends beyond Ramsey County | 76,603 | +8.7% | Counted whole |
| Maplewood | 40,717 | −3.1% | 7.5% |
| Roseville | 35,663 | −1.5% | 6.6% |
| Shoreview | 26,906 | Level | 5.0% |
| White Bear Lakeextends beyond Ramsey County | 23,392 | −5.6% | Counted whole |
| New Brighton | 22,159 | −4.9% | 4.1% |
| Vadnais Heights | 13,052 | +0.7% | 2.4% |
| Mounds View | 12,786 | −3.8% | 2.4% |
| North St. Paul | 12,780 | +3.5% | 2.4% |
| Little Canada | 10,567 | −2.1% | 2.0% |
| St. Anthonyextends beyond Ramsey County | 9,989 | +8.2% | Counted whole |
Places in Ramsey County with a city page: 1 of 1
- Arden Hills
- Spring Lake Park (part)
- North Oaks
- Falcon Heights
- Lauderdale
- Gem Lake
18 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. “(part)” marks a place that extends into another county. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025). A place that extends beyond Ramsey County is counted whole, so it has no share.
Ramsey County, Homes
Homes in Ramsey County
Ramsey County has 231,606 homes, and many share a building: 32% are in buildings of five or more, 52% are detached houses, against 66% across Minnesota. The homes are older than Minnesota's as a whole: half were built before 1965 (1978 for Minnesota), and 44% date from before 1960. 61% of occupied homes are lived in by their owner (Minnesota: 72%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Ramsey County | Minnesota |
|---|---|---|
| Housing units | 231,606 | 2,519,538 |
| Detached houses | 52% | 66% |
| In buildings of 5 or more | 32% | 19% |
| Mobile homes | 1% | 3% |
| Built before 1960 | 44% | 29% |
| Built since 2000 | 12% | 22% |
| Middle year built | 1965 | 1978 |
| Owner-occupied | 61% | 72% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.